Mapping an anonymous user to activity

Hi everyone,

I am trying to map an activity to a public/not logged in user. I tried this:

Map participant to anonymous (logged out) users

and to manage the permission in the form or the userview, however I always get the default "No Permission" screen. In the form I have a custom "No Permission" response and in the userview I can not manage the permission for the "Run Process" component.

So I am a bit lost, where this message comes from and how I can fix it.

The thing is: If I use the answer of the other question above, I do not have access when I am logged in, so basically it should work. Also when I set the form permission to "is anonymous" it shows my custom "No Permission" response when I am logged in.

Thanks for your help

Joshua